中国蚕桑生态系统能值分析

蚕桑生态系统是我国农业生态系统的重要组成部分.本文采用能值评估原理和方法,系统研究了中国蚕桑生态系统的内部结构及其与外界自然、环境、经济之间的关系,定量计算了反映中国蚕桑生态系统的能值指标，并与中国农业生态系统相比较.结果表明，中国蚕桑生态系统能值投入率(EIR)为3.78，能值产出率(EYR)为4.68，环境负载率(ELR)为0.18，系统能值可持续指标(ESI)为26.0，表明中国蚕桑生态系统环境压力小，生态效益良好，但需进一步提升科技水平，以降低劳动力投入，促进蚕桑资源综合利用.

Emergy analysis of mulberry-silkworm ecosystem in China

Mulberry-silkworm ecosystem is one of the important agro-ecosystems in China. Based on the principles and methods of emergy analysis, this paper studied the interior structure of mulberry-silkworm ecosystem and its relationship with exterior environment and economy. Some emergy indices for this ecosystem were quantitatively calculated, and compared with those of the agro-ecosystem in China. The results showed that the emergy investment ratio, emergy yield ratio, environmental loading ratio and emergy sustainability index was 3.78, 4.68, 0.18 and 26.0, respectively, suggesting the low environmental pressure and good ecological benefit in mulberry-silkworm ecosystem in China. Hi-technology was required to further decrease the labor force input and enhance the comprehensive utilization of sericultural resources.